The psychologist for jodi arias taking the stand for a fourth day and the jury gets to ask him questions after the defense tried to do some damage control after his cross-examination. Abc's ryan owens is in phoenix, arizona, this morning with the latest. Good morning to you, ryan. Reporter: Good morning, josh. Arizona is one of only three states that allows jury members to actually ask questions of the witness. We understand they have a whole lot, some 70 questions for the good doctor who has been on the stand all week. Nothing but the truth, so I do. Reporter: Dr. Richard samuels is pivotal to jodi arias' defense. The psychologist who made $250 an hour evaluating the 32-year-old admitted killer diagnosed her with ptsd. He says the stress of shooting and repeatedly stabbing her ex-boyfriend, travis alexander, caused her to forget committing the crime. Right, made it up right now. Speculated. Nope. Clinical judgment, sir. Reporter: He's had a tough few days on the stand. He was even forced to acknowledge arias lied to him during the ptsd test. Back then she said she was so traumatized because she had to watch helplessly has masked intruders killed alexander. She later admitted she did it but claims it was in self-defense. Perhaps I should have readministered that test. Reporter: The defense team did their best wednesday to rehabilitate their expert witness by arguing ing arias' lies do not invalidate the does that change her score in y way? No. Reporter: He's trying to convince the jury she lived through a traumatic event, just not the one she told him about when she was diagnosed. Plus, he claim, it's not like jodi arias who repeatedly lied to everyone for years about the crime could fool his test. It requires an advance degree to truly understand how these tests are formulated. So while it is possible, it's highly improbable that someone could feign the results. Reporter: Full disclosure here, we were supposed to get to jury questions yesterday for dr. Samu samuels, but a member of the general public who had shown up to watch this trial threw up all over the courtroom floor. At that point the judge decided it was probably a good idea to adjourn early for the day, josh, if the content of this trial is making you sick, it's fair to say you're not alone. It gets more bizarre by the day there. Thank you, ryan. That, it does.

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